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Method for utilizing comprehensive resource of sulfur-containing solid waste

A solid waste and comprehensive resource technology, applied in the field of two types of sulfur-containing solid waste - pyrite and gypsum slag, can solve problems such as difficulty in ensuring the working conditions of fluidized fluidized furnaces, waste of pyrite iron resources, and secondary pollution. To achieve the effect of solving the problems of stacking land, environmental pollution and hidden safety hazards, facilitating the utilization of waste resources, and avoiding the destruction of the ecological environment

Inactive Publication Date: 2009-11-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of using recycled pyrite instead of natural pyrite to produce acid is that the recovered pyrite contains a certain amount of carbon, which makes it difficult to ensure the working conditions in the fluidized furnace. Even if the acid production process requirements are met, there will be Acidic waste water, waste gas, and a large amount of sulfuric acid slag have become another environmental problem, and have also wasted precious iron resources in pyrite ore
Although a lot of research has been done on the utilization of desulfurization gypsum and coal-washing pyrite in my country, the overall utilization level is low, and due to the limitations of various industries, there is a lack of overall thinking in the utilization approaches, especially the existing single-link " End-of-life treatment” methods and technologies have not really effectively realized the high value-added utilization of waste as a whole, and may cause secondary pollution

Method used

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  • Method for utilizing comprehensive resource of sulfur-containing solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The pyrite with a purity (mass percentage content of iron disulfide) of 70% is crushed to less than 4mm, and sent into a fluidized bed pyrolysis reactor with a temperature of 650°C, and the pyrolysis atmosphere is kept as a neutral atmosphere. For 20 minutes, the flue gas is cooled, and the solid sulfur formed by the condensation of sulfur vapor in the flue gas is collected to obtain elemental sulfur products.

[0044] Mix the solid pyrolysis product discharged from the fluidized bed pyrolysis reactor with anthracite and calcium oxide-containing solids. The molar ratio of ferrous sulfide, carbon, and calcium oxide in the mixture is 1:1:1, and the mixture is pulverized to 4mm or less, send it into a fluidized bed reduction reactor with a temperature of 900°C, keep the reaction atmosphere as a reducing atmosphere, and the reaction time is 30min, and recycle the flue gas containing carbon monoxide as fuel gas to provide heat source for other steps.

[0045] The solid matte...

Embodiment 2

[0048] Pulverize pyrite with a purity (mass percentage content of iron disulfide) of 90% to less than 2mm, and send it into a fluidized bed pyrolysis reactor with a temperature of 750°C, keep the pyrolysis atmosphere as a weakly reducing atmosphere, and stay The time is 10 minutes; the flue gas is cooled, and the solid sulfur formed by the condensation of sulfur vapor in the flue gas is collected to obtain elemental sulfur products.

[0049] The solid pyrolysis product discharged in the fluidized bed pyrolysis reactor is mixed with charcoal and calcium oxide-containing solids. The molar ratio of ferrous sulfide, carbon, and calcium oxide in the mixture is 1: 1.5: 1.5, and the mixture is pulverized to 3mm or less, send it into a fluidized bed reduction reactor with a temperature of 1150°C, keep the reaction atmosphere as a reducing atmosphere, and the reaction time is 20min; the flue gas containing carbon monoxide is recycled as fuel gas to provide heat source for other steps. ...

Embodiment 3

[0053] The pyrite with a purity (mass percentage content of iron disulfide) of 100% is crushed to less than 2mm, and sent into a fluidized bed pyrolysis reactor with a temperature of 850°C, and the pyrolysis atmosphere is kept as a neutral atmosphere. 2 minutes; the flue gas is cooled, and the solid sulfur formed by the condensation of sulfur vapor in the flue gas is collected to obtain elemental sulfur products.

[0054] Mix the solid pyrolysis product discharged from the fluidized bed pyrolysis reactor with coke and calcium oxide-containing solids. The molar ratio of ferrous sulfide to carbon and calcium oxide in the mixture is 1:2:2, and the mixture is pulverized to 2 mm or less, it is sent to a fluidized bed reduction reactor at a temperature of 1000 ° C, and the reaction atmosphere is kept as a reducing atmosphere, and the reaction time is 15 minutes; the flue gas containing carbon monoxide is recycled as fuel gas to provide heat sources for other steps.

[0055] The soli...

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Abstract

The invention discloses a method for utilizing comprehensive resource of sulfur-containing solid waste, which comprises the following steps: (1) pyrolyzing sulfurous iron ore to obtain pyrrhotite and an elemental sulfur product; (2) mixing the pyrrhotite, a carbon-containing substance and a calcium-containing substance to carry out reduction reaction under a high temperature to obtain a solid mixture of elemental iron and calcium sulfide; (3) magnetically separating the solid mixture, and separating and recovering the solid mixture to obtain the elemental iron; (4) mixing and heating the solid containing the calcium sulfide and dehydrated gypsum to obtain tail gas containing SO2 and solid containing calcium oxide; and (5) separating the tail gas containing the SO2 through liquefying to obtain a liquid SO2 product, and using the solid containing the calcium oxide as the calcium-containing substance to participate in the reaction of the step (2) and as flue gas desulfurizing agent for cyclically utilization. The method solves the problems of occupied floor due to the stacking of desulfurization gypsum and coal washing sulfurous iron ore, environment pollution and potential safety hazard, makes full use of calcium, sulfur and iron resources rich in the wastes, and can realize recycling economy and clean production.

Description

technical field [0001] The invention belongs to the technical field of energy and environment, and relates to a method for comprehensively utilizing two types of sulfur-containing solid wastes—pyrite ore and gypsum slag—produced in coal washing desulfurization and flue gas wet desulfurization processes. Background technique [0002] Sulfur is a harmful element in coal, and high sulfur content is one of the characteristics of my country's coal resources. Coal-fired sulfur dioxide SO 2 Pollution has become the main feature of air pollution in my country (especially in the southwest region where high-sulfur coal reserves are abundant). The most effective way to control sulfur emissions is flue gas desulfurization. my country's "Eleventh Five-Year Plan" puts flue gas desulfurization in coal-fired power plants as a key project for environmental governance, and clearly stated that increasing the desulfurization capacity of existing coal-fired power plants will make 90% of the cur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02C01B17/50C21B15/00B01D53/96
Inventor 刘豪闫志强赵然邱建荣
Owner HUAZHONG UNIV OF SCI & TECH
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